Trap is used in steam pipe network and equipment, can automatically discharge condensate, air and other non-condensable gas, and water vapor leakage valve. According to the different working principle of traps, traps can be divided into the following types: First, the mechanical type: rely on lever float trap condensate level changes in the water level and action, including: Float: Float closed Hollow sphere open up Float type: float up to open the barrel-type Open downward Float: float down to open the barrel Second, the thermostatic type: Rely on the liquid temperature changes and actions, including: bimetallic Film: The sensitive original is bimetallic vapor pressure type: The sensitive original is the bellows or the ink cartridge, the interior is filled with the volatile liquid. THERMODYNAMIC: Rely on the change of the thermodynamic properties of the liquid. This type of valve in the pipeline should be generally horizontal installation. Disc type: Due to the same pressure, the flow rate of liquid and gas are different, resulting in different dynamic and static pressure to actuate the disc valve pulse: Due to the different temperatures of the condensate through the two series in series orifice Plate, sitting in the bipolar orifice between the different pressures, driving the valve action. Fourth, the structure and working principle of the trap Traps in the steam heating system to play a role in blocking steam drainage, select the appropriate trap, the steam heating equipment to achieve maximum efficiency. In order to achieve the best results, we must conduct a comprehensive understanding of the performance of various types of traps, features. Trap a lot of varieties, each with different properties. The choice of traps, the first choice should be its characteristics to meet the best operation of steam heating equipment, and then consider other objective conditions, so you need to select the trap is correct and effective. Traps to be able to "identify" steam and condensate in order to play the role of gas blocking drainage. "Identifying" steam and condensate is based on three principles: density difference, temperature difference and phase transition. So according to three principles to create three types of trap: classified as mechanical type, thermal type, thermal type. V. Mechanical Traps: Mechanical type, also known as the float type, is the use of condensed water and steam density difference, through the condensation of liquid level changes, so that the float lift valve to open or close, to block steam drainage purposes. Mechanical type of small degree of supercooling traps, free from pressure and temperature changes, the water that is row, no water heating equipment, heating equipment can achieve the best heat transfer efficiency. Maximum back pressure ratio of 80%, high quality workmanship, the production process is the ideal heating device steam trap. Mechanical traps have free float, free half float, lever float, inverted bucket and so on. 1. Free Float Traps: Free float traps simple structure, the internal only a fine grinding of stainless steel hollow float moving parts, both float and opening and closing pieces, non-wearing parts, long service life, YQ trap internal with Y series automatic exhaust air device, very sensitive, can automatically discharge air, high quality work. When the equipment is just started to work, the air in the pipeline is exhausted by the Y series automatic exhaust air device. The low temperature condensate water enters the steam trap, the condensate water level rises, the float rises, the valve opens, the condensate water rapidly discharges and the steam quickly enters Equipment, equipment, rapid heating, Y series of automatic exhaust air temperature of liquid expansion device, automatic exhaust air device is turned off. Traps began to work normally, the float with the condensate level rise and fall, block steam drainage. Free float ball valve seat is always below the liquid level to form a water seal, no steam leakage, energy saving effect. Minimum working pressure 0.01Mpa, from 0.01Mpa to the maximum operating pressure range from the impact of temperature and pressure fluctuations, continuous drainage. To the saturation temperature condensate water, the minimum undercooling is 0 ℃, heating equipment without water, make the heating equipment to achieve the best heat transfer efficiency. Back pressure rate greater than 85%, is the production of process heating equipment, one of the best traps. 2. Free half-float trap: Free half-float trap Only one half-float bucket is a moving part, opening down, the bucket is the opening and closing pieces, but also the seal. The entire spherical surface can be sealed, long service life, water hammer, no wearing parts, trouble-free, durable, no steam leakage. The back pressure rate is greater than 80%, to the saturation temperature condensate water, the minimum undercooling is 0 ℃, heating equipment without water, can make the heating equipment to achieve the best heat transfer efficiency. When the device is just started, air and low temperature condensate in the pipeline enter the steam trap through the launch tube. The bimetallic emptying element in the valve bounces the bucket open, the valve opens, and the air and low temperature condensate drain rapidly. When the steam enters the bucket, the bucket produces upward buoyancy, while the temperature inside the valve rises, the bimetallic emptying element contracts and the ball is poled toward the valve port and the valve is closed. When the steam inside the bucket becomes condensed water, the bucket loses its buoyancy and sinks, the valve opens and the condensate drains quickly. When the steam enters the barrel again, the valve is closed again, intermittently and continuously. 3. Lever Float Traps: Lever float traps with the same basic characteristics of the free float, the internal structure of the floating ball is connected to the lever to drive the valve heart, with the condensation of the liquid level switch valve. Leveraged float traps use double seats to increase the condensate displacement to achieve a small volume displacement, the maximum hydrophobic capacity of 100 tons / hour, is the ideal large-scale heating equipment traps. 4. Inverted bucket trap: Inverted bucket trap inside is an inverted bucket for the level of sensitive parts, bucket opening down, inverted bucket connected to the valve lever to open the valve lever. Upside-down bucket trap to the air, not afraid of water hammer, anti-fouling performance. Undercooling is small, the leakage rate is less than 3%, the maximum back pressure rate of 75%, more connectors, the sensitivity is better than the free float trap. Because inverted bucket steam trap is closed by steam buoyancy valve, working pressure less than 0.1MPA, not suitable for use. When the device is started, air and low temperature condensate in the pipeline enter the steam trap, the inverted bucket falls by its own weight, the inverted bucket connects the lever to drive the valve core to open the valve, and the air and low-temperature condensed water are quickly discharged. When the steam enters the inverted bucket, the steam in the inverted bucket generates upward buoyancy, and the inverted bucket rises to connect the lever to drive the valve heart to close the valve. Inverted bucket has a small hole, when part of the steam discharged from the hole, the other part of the steam condensate generated, the inverted bucket loses its buoyancy, by its own weight to the sink, inverted bucket connected lever to open the valve heart valve, circulation Work, intermittent drainage. 5. Combined superheated steam traps: Combined superheated steam traps have two isolated valve chamber, the two stainless steel pipe connected to the upper and lower valve cavity, which is by the float and inverted bucket trap combination, the valve The structure is advanced and reasonable. Under the working conditions of overheating, high pressure and light load, the condensate formed when the superheated steam disappears can be discharged in time, effectively preventing overheated steam leakage and high working quality. The maximum allowable temperature of 600 ℃, the valve body is all stainless steel, the valve seat is carbide steel, long service life, is a steam trap for superheated steam, made two national patents, to fill the gap. When the condensate into the lower chamber, the deputy valve float with the liquid level rise, the float closed into the steam hole. Condensate water pipe up through the main valve cavity, inverted bucket falling by its own weight, driven by the valve core to open the main valve, condensate discharge. When the vice cavity of the condensate water level drops, the float drops with the liquid level, deputy valve open. The steam enters into the inverted bucket from the inlet pipe into the upper main valve cavity, and the inverted bucket produces upward buoyancy. The inverted bucket drives the valve core to close the main valve. When the secondary valve cavity condensate water level then rise, the next cycle began again, intermittent drainage.
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